Support of quality of service control in a mobile communication system

ABSTRACT

In an embodiment, a method is provided for support of Quality of Service QoS control in a mobile communication system wherein an User Equipment has access to a mobile network providing Packet Data Network (PDN) connectivity services, said mobile network including a 3GPP Core Network (CN) accessed by a trusted non-3GPP Access Network (TNAN) via an interface between an Access Network Gateway (AN-GW) in said Trusted non-3GPP Access Network (TNAN) and a PDN Gateway PDN-GW in said 3GPP CN, said method including support of 3GPP CN-initiated QoS control, for uplink traffic from said UE, based on QoS control information received by said UE, said QoS control information allowing the UE to associate uplink traffic flows sent by the UE via Access Network Gateway (AN-GW) towards a PDN Gateway PDN-GW with TNAN connectivity QoS for uplink traffic.

The present invention generally relates to mobile communication networksand systems.

Detailed descriptions of mobile communication networks and systems canbe found in the literature, such as in particular in TechnicalSpecifications published by standardization bodies such as for example3GPP (3^(rd) Generation Partnership Project).

In general, in a packet mobile communication system, an User Equipment(UE) has access to a mobile network providing Packet Data Network (PDN)connectivity services (typically IP connectivity services). A mobilenetwork generally comprises a Core Network (CN) accessed by an AccessNetwork (AN). The CN generally comprises, amongst others, a PDN Gateway(PDN-GW) interfacing with an external PDN (typically an IP network, suchas Internet, Intranet, or Operator's IP network e.g. IMS network).

An example of packet mobile communication system is Evolved PacketSystem (EPS). An EPS network comprises a CN (called Evolved Packet Core(EPC)), which can be accessed by a 3GPP Access Network (3GPP AN) such asfor example E-UTRAN, as well as by a Non-3GPP Access Network (non-3GPPAN) such as for example WLAN. 3GPP access to EPC for E-UTRAN isspecified in particular in 3GPP TS 23.401. Non-3GPP Access to EPC isspecified in particular in 3GPP TS 23.402.

A distinction between trusted and un-trusted non-3GPP ANs, for non-3GPPaccess to EPC, has been introduced in particular in 3GPP TS 23.402 and3GPP TS 33.402. As described in 3GPP TS 23.402, a trusted non-3GPP ANinterfaces with a PDN-GW (also called PGW in EPC) directly via aninterface called S2a interface which can be based on GTP (GPRSTunnelling Protocol)- or on PMIP (Proxy Mobile IP).

An example of architecture for Trusted WLAN access to EPC is illustratedin FIG. 1 taken from 3GPP TS 23.402. A functional split within a TrustedWLAN Access Network (TWAN) is illustrated in FIG. 2 taken from 3GPP TS23.402. TWAN includes, in particular, a WLAN Access Network whichinterfaces with the UE, and a Trusted WLAN Access Gateway (TWAG) whichterminates the S2a interface. The architecture is anyhow generic for anyNon 3GPP Access Network and a Trusted WLAN Access Network (TWAN) is tobe considered as just an example of any Trusted Non 3GPP Access Network(TNAN).

A PDN/IP connection established between an UE and a PDN/IP network overa mobile network (such as EPS network) can be used to have access tovarious IP-based user services or applications.

Quality of Service (QoS) is one of the most important issues in suchsystems. QoS support gives network operators tools for servicedifferentiation by providing different treatment for traffic withdifferent QoS requirements. Network-initiated QoS control gives networkoperators control over the QoS for the services they provide andincludes a set of signalling procedures for controlling QoS assigned bythe network. Network-initiated QoS control and associated signallingprocedures are specified in particular in 3GPP TS 23.203. In EPS, thesesignalling procedures include procedures whereby a Policy and ChargingRules Function (PCRF) in EPC initiates the setting-up or modification ofa dedicated bearer with a specific QoS for a specific user service orapplication, towards the UE. In the example of the architectureillustrated in FIG. 1, such signalling includes signalling between PCRFand PGW over the Gx interface that is transformed by the PGW intorelevant signalling to the Access Network Gateway AN-GW (e.g. ServingGateway reached over S5/S8 for a 3GPP Access Network, TWAG reached overS2a for a Trusted WLAN Access Network) using signalling (GTP/PMIP)defined over SS/S8/S2a. When Proxy Mobile IP is employed as signallingprotocol towards the Access Network Gateway AN-GW, a Diameter based Gxainterface can be used to convey QoS requests directly from PCRF to theAccess Network Gateway AN-GW (in this case QoS requests are not handledby the PGW).

A problem, however, for network-initiated QoS control for non-3GPPaccess to a 3GPP CN such as EPC, is to ensure that the UE applies properQoS for uplink traffic. If such problem is not solved, uplink trafficmay not be handled with adequate QoS, which, in particular for userservices or applications having high QoS requirements (such as real-timeuser services or applications, such as for example voice over IMS), maynot be acceptable. As recognized by the inventors and as will beexplained with more detail later, there is a need for a generic solutionto such problem. More generally there is a need to improve QoS controland/or performances of such systems.

Embodiments of the present invention in particular address such needs.These and other objects are achieved, in one aspect, by a method forsupport of Quality of Service (QoS) control in a mobile communicationsystem wherein an User Equipment has access to a mobile networkproviding Packet Data Network (PDN) connectivity services, said mobilenetwork including a 3GPP Core Network (CN) accessed by a trustednon-3GPP Access Network (TNAN) via an interface between an AccessNetwork Gateway AN-GW in said Trusted non-3GPP Access Network (TNAN) anda PDN Gateway PDN-GW in said 3GPP CN, said method including support of3GPP CN-initiated QoS control, for uplink traffic from said UE, based onQoS control information received by said UE, said QoS controlinformation allowing the UE to associate uplink traffic flows sent bythe UE via Access Network Gateway AN-GW towards a PDN Gateway PDN-GWwith TNAN connectivity QoS for uplink traffic.

These and other objects are achieved, in other aspects, by variousentities of a mobile communication system, configured to carry outrelated step(s) of such method, said entities including, in particular(though not exclusively): User Equipment UE, Trusted non-3GPP AccessNetwork Gateway (AN-GW) (such as in particular TWAG for Trusted WLANaccess).

Some embodiments of apparatus and/or methods in accordance withembodiments of the present invention are now described, by way ofexamples only, and with reference to the accompanying drawings, inwhich:

FIG. 1 is intended to recall an example of architecture for Trusted WLANAccess to EPC,

FIG. 2 is intended to recall an example of Trusted WLAN functionalsplit,

FIG. 3 is intended to illustrate an example of architecture for TrustedWLAN Access to EPC using embodiments of the present invention.

Various embodiments and/or aspects of the present invention will be moredetailed in the following, by way of example for Trusted WLAN Access toEPC and EPC-initiated QoS control. However it should be understood thatthe present invention is not limited to this example, and more generallyapplies to Trusted Non-3GPP Access to a 3GPP CN and 3GPP-CN initiatedQoS control. Establishment/supervision/release of connections between aterminal (UE) and a PDN Gateway (PGW) in EPC through a Trusted WLAN isunder study at 3GPP under the “SaMOG” Work/Study Item.

The Trusted WLAN is composed of at least one or several WIFI AccessPoints (AP) and a Trusted WLAN Gateway (TWAG), defined in 3GPP TS23.402. The TWAG interfaces the PGW via a S2a interface which is similarthe S5/S8 interface between a SGW and a PGW for E-UTRAN access to EPC.

Several solutions are proposed and they all comprise a protocol betweenthe UE and the TWAG to establish, release and supervise PDN connectionsbetween the UE and the PGW. The UE is always the entity that initiatesthe establishment of PDN connections. These PDN connections areestablished with a Default Bearer over S2a, which is generallyassociated with a best effort quality of service (QoS) that is notadapted to services with tougher QoS requirements e.g. voice.

The UE can communicate to applications via such PDN connections. Certainapplications (e.g. Voice over IMS) trigger PCRF (Policy and ChargingRules Function) to request connectivity with an appropriate QoS betweenthe PGW and the UE for both uplink and downlink traffic of theapplication (e.g. voice). There are other possible triggers for the PCRFto decide upon requesting connectivity with an appropriate QoS betweenthe PGW and the UE for both uplink and downlink traffic of theapplication. The notification of the detection of an application by anode enforcing traffic analysis/“Deep Packet Inspection” as an exampleof such other possible trigger.

PCRF requests the PGW to setup a “dedicated bearer” with the appropriateQoS (including the QoS Class Identifier QCI) and with traffic filters(used to map IP flows of the application, e.g. VoIP, onto theappropriate bearer hence to the appropriate QoS) . The PGW establishessuch bearer via setting “Traffic Filters” for downlink in the PGW (usedto map IP flows onto bearers) and sends a GTP/PMIP signaling message tothe TWAG containing the appropriate QCI and the appropriate TrafficFilter for the Uplink direction (called UL TFT).

In some deployments, the PCRF may contact directly the AN-GW (e.g. TWAG)to provide the AN-GW (e.g. TWAG) with the appropriate QoS requirementsincluding traffic filters used to map IP flows (of the application, e.g.VoIP), onto the QoS required by these IP flows. A Diameter basedinterface is used for that purpose.

For the Downlink traffic, the TWAG maps the QCI to the appropriatetransport QoS between the TWAG and the AP, and then the AP maps thetransport QoS to the radio QoS (e.g. 802.11 QoS).

The downlink traffic that is sent once the dedicated bearer isestablished will therefore experience the required QoS.

However, the UE does not have the uplink Traffic Filters to correctlymap the uplink traffic to the appropriate uplink QoS.

A possible solution to such problem would be that the UE looks at the IPpackets of the IP flow received in the downlink and use the downlink QoS(e.g. DSCP or 802.11 QoS) to determine the uplink QoS. But this solutiondoes not fit with unidirectional uplink traffic.

There is a need for a more generic solution to such problem.

Embodiments of the present invention in particular address such needs.

First embodiments of the present invention may comprise at least part ofthe following steps, which may be triggered when a non 3GPP AccessNetwork Gateway AN-GW (*1) has received from the EPC (*2) informationmapping Uplink IP flows (*3) from the UE to a 3GPP QoS:

the Access Network Gateway AN-GW provides the UE with informationincluding following parameters: description of the Uplink IP flows(filtering rule) and of their associated QoS:

-   -   e.g. using any signaling protocol between the AN-GW and the        terminal (UE);    -   e.g. adding a new downlink message in said signaling protocol to        convey said information from the AN-GW to the terminal (UE);    -   The UE e.g. acknowledging the previous message via a new uplink        message in said signaling protocol.

For each IP packet the UE needs to send Uplink to the EPC via the AN-GWthe UE evaluates the filtering rules to map the Uplink IP packet to theappropriate QoS to use to send this packet to the EPC.

*1: an example of non 3GPP Access Gateway AN-GW is a TWAG (Trusted WLANAN Gateway as defined in 3GPP TS 23.402)

*2: the Access Gateway AN-GW may receive the information mapping fromthe PGW (over S2a) or from the PCRF (e.g. over a Gx based Policyinterface)

*3: the Uplink flows may correspond to IP traffic defined by its sourceand/or destination IP address and associated ports and/or application

In other words, in the considered example of WLAN access to EPC andEPC-initiated QoS control, above-mentioned first embodiments includesupport of EPC-initiated QoS control, for uplink traffic from the UE,based on QoS control information received by the UE, said QoS controlinformation allowing the UE to associate uplink traffic flows sent bythe UE via TWAG towards PGW with an appropriate TWAN connectivity QoSfor uplink traffic.

Still in other words, in these first embodiments and in this example,the UE receives from the TWAG rules mapping uplink traffic flows to TWANconnectivity QoS.

The term “traffic flow” has the meaning it usually has, i.e. it refersto a stream of packets sharing common features, e.g. packets having asame source and destination address, source and destination port number,and protocol ID (which is also referred to as packet filterinformation).

TWAN connectivity QoS may e.g. be defined by IP-level QoS parameterinformation, such as Differentiated Services CodePoint as defined inIETF RFC 2474 (DSCP) parameter set by the UE in the IP header of IPpackets sent in uplink by the UE via the TWAG towards the PGW.

TWAN connectivity QoS may, or may not, be mapped to EPC connectivityQoS. EPC connectivity QoS may e.g. be defined by 3GPP QoS parameterinformation such as QCI parameter assigned to a 3GPP S2a bearer to whichthe traffic flow should be mapped. It may be preferred that such mappingbetween TWAN connectivity QoS and EPC connectivity QoS is provided, butthis is not necessary. In embodiments described next, such mapping canbe provided.

Second embodiments of the present invention may include at least part ofthe following steps which may be provided when a gateway in the corenetwork (e.g. PGW) establishes or modifies a dedicated (bidirectional orunidirectional) bearer with a specific QoS over its interface with theAccess Network Gateway (e.g. TWAG) via a signaling protocol (e.g. GTP orPMIPv6):

the Access Network Gateway (e.g. TWAG) provides the terminal (e.g. via asignaling message) with the appropriate 3GPP quality of service andpacket filtering information (e.g. QCI, ARP, MBR for QoS information andUL TFT for packet filtering information, per 3GPP TS 24.008 or TS23.402) enabling the terminal to map an IP flow to an appropriate set of3GPP QoS parameters. In addition, the Access Network Gateway providesthe mapping between the IP QoS (e.g. DSCP) and the 3GPP QoS (e.g. QCI)that is applied by the AN-GW to an uplink IP packet, in order for the UEto derive the IP QoS to be applied to an uplink IP packet,

for each IP packet the UE needs to send Uplink to the EPC via the AccessGateway AN-GW the UE evaluates the filtering rules (received from theAccess Network Gateway AN-GW) to map the Uplink IP packet to theappropriate QoS to use to send this packet to the EPC; This allows theuplink entities on the path (e.g. radio access point, Access NetworkGateway AN-GW) to

-   -   Provide the adequate QoS on the path from the UE to the PGW    -   route the uplink IP flow towards the corresponding bearer        between the Access Network Gateway AN-GW and the core network        (e.g. PGW).

In other words, in the considered example of WLAN access to EPC andEPC-initiated QoS control, above-mentioned second embodiments includesupport of EPC-initiated QoS control, for uplink traffic from the UE,based on QoS control information received by the UE:

said QoS control information allowing the UE to associate uplink trafficflows sent by the UE via TWAG towards PGW with TWAN connectivity QoS foruplink traffic,

said QoS control information received by said UE including first QoScontrol information associating uplink traffic flows with 3GPP CNconnectivity QoS, and second QoS control information mapping 3GPP CNconnectivity QoS to TWAN connectivity QoS for uplink traffic.

Still in other words, in these second embodiments and in this example,the UE receives from the TWAG rules mapping:

first from uplink traffic flows to EPC connectivity QoS,

second from EPC connectivity QoS to TWAN connectivity QoS.

In the example of Trusted WLAN access network with access to EPC, asalso illustrated in FIG. 3 for the case of a GTP based interface betweenthe PGW and the AN-GW, the PCRF requests the PGW to allocate appropriateresources and the PGW either establishes a new dedicated bearer with theappropriate QCI (defined in 3GPP TS 23.203) or modifies the existingdedicated bearer (using the Create Dedicated Bearer Request or theUpdate Bearer Request GTP-c messages). Each bearer is associated with aQCI. Among other parameters, the QCI, the uplink maximum bit rate, theAllocation/Retention Priority (ARP) and the EPS Bearer Level TrafficFlow Template (Bearer TFT) parameters are sent over S2a interface to theTWAG via GTP-c message as specified in 3GPP TS 29.274 (see clause 8.15and 8.19), or any signaling message from PGW. EPS Bearer Level TFT IE isspecified in 3GPP TS 24.008 clause 10.5.6.12 and contains uplink anddownlink filters.

In some deployments, the PCRF may contact directly the AN-GW (e.g. TWAG)to provide the AN-GW (e.g. TWAG) with the appropriate QoS requirementsincluding traffic filters (Flow-Information) used to map IP flows (ofthe application, e.g. VoIP) onto the QoS-Information (QCI) required bythese IP flows.

Third embodiments of the invention may comprise at least part of thefollowing steps, which may be triggered in case of establishing a newdedicated bearer or modifying an existing dedicated bearer:

-   -   Providing the UE with information including following        parameters: traffic filtering parameters contained in the TFT        (containing uplink and downlink filters), and either QoS        parameters that correspond to 3GPP QoS parameters (QCI with        possibly ARP, MBR Maximum Bit Rate) and mapping between IP level        QoS parameters (e.g. DSCP) and 3GPP QoS parameters that is        applied in the AN-GW for the uplink traffic, or IP level QoS        parameters (e.g. DSCP) that may or not be mapped to 3GPP QoS        parameters;    -   Using any signaling protocol between the TWAG and the terminal        (UE);    -   Adding a new downlink message in the said signaling protocol to        convey the said information from the TWAG to the terminal;    -   Adding a new uplink message in the said signaling protocol from        the terminal to the TWAG to acknowledge the previous message;    -   Triggering the downlink message from the TWAG to the terminal        after the

TWAG has received S2a GTP Create Bearer Request message (or any messagefrom a PGW or from a PCRF and that is associated with new QoSrequirements for the traffic flows related with the UE).

In other words, in the considered example of WLAN access to EPC andEPC-initiated QoS control, above-mentioned third embodiments includesupport of EPC-initiated QoS control, for uplink traffic from the UE,based on QoS control information received by the UE,

said QoS control information allowing the UE to associate uplink trafficflows sent by the UE via TWAG towards PGW with TWAN connectivity QoS foruplink traffic (as in said first embodiments),

wherein said QoS control information received by said UE may (as in saidsecond embodiments)include first QoS control information associatinguplink traffic flows with 3GPP CN connectivity QoS, and second QoScontrol information mapping 3GPP CN connectivity QoS to TWANconnectivity QoS for uplink traffic.

Still in other words, in these third embodiments and in this example,the UE may receive from the TWAG:

either (as in said first embodiments) rules mapping uplink traffic flowsto TWAN connectivity QoS,

or (as in said second embodiments) rules mapping:

first from uplink traffic flows to EPC connectivity QoS, and

second from EPC connectivity QoS to TWAN connectivity QoS.

In FIG. 3, QoS control information received by the UE is illustrated by“QoS information and UL TFT” signaled by TWAG to UE in a new message.

FIG. 3 also illustrates the mapping, at the TWAG, between EPCconnectivity QoS (e.g. QCI) and TWAN connectivity QoS (e.g. DSCP).

Different embodiments (including part or all of above describedembodiments), may also include that:

The mapping from IP level parameter (e.g. DSCP parameter) to 802.11 QoSparameter is done by the UE based on information broadcast by the AccessPoint (AP), i.e. based on principles described in IEEE 802.11, which isillustrated in FIG. 3 by the WLAN AP signaling 802.11 “QoS Map Setinformation element”.

In one aspect, there is provided a method for support of Quality ofService QoS control in a mobile communication system wherein an UserEquipment (UE) has access to a mobile network providing Packet DataNetwork (PDN) connectivity services, said mobile network including a3GPP Core Network (CN) accessed by a trusted non-3GPP Access Network(TNAN) via an interface between an Access Network Gateway (AN-GW) insaid Trusted non-3GPP Access Network (TNAN) and a PDN Gateway (PDN-GW)in said 3GPP CN, said method including support of 3GPP CN-initiated QoScontrol, for uplink traffic from said UE, based on QoS controlinformation received by said UE, said QoS control information allowingthe UE to associate uplink traffic flows sent by the UE via AccessNetwork Gateway (AN-GW) towards a PDN Gateway (PDN-GW) with TNANconnectivity QoS for uplink traffic.

Various embodiments are provided, which may be used alone or incombination, according to various combinations.

In an embodiment, said QoS control information received by said UEincludes packet filter information associated with uplink traffic flows.

In an embodiment, said QoS control information received by said UEincludes mapping between uplink traffic flows and TNAN connectivity QoSfor uplink traffic.

In an embodiment, said QoS control information received by said UEincludes first QoS control information associating uplink traffic flowswith 3GPP CN connectivity QoS, and second QoS control informationmapping 3GPP CN connectivity QoS to TNAN connectivity QoS for uplinktraffic.

In an embodiment, 3GPP CN connectivity QoS parameter informationincludes 3GPP QoS parameter information.

In an embodiment, TNAN connectivity QoS parameter information includesIP level QoS parameter information.

In an embodiment, said method comprises:

said AN-GW receiving first QoS control information associating uplinktraffic flows with 3GPP CN connectivity QoS from said PDN-GW

In an embodiment, said method comprises:

said AN-GW generating a mapping from 3GPP CN connectivity QoS to TNANconnectivity QoS for uplink traffic.

In an embodiment, said method comprises:

said AN-GW sending said QoS control information for uplink traffic tosaid UE using a signalling protocol between said AN-GW and said UE.

In an embodiment, said method comprises:

said UE acknowledging the reception of said QoS control information fromsaid AN-GW, using a signalling protocol between said UE and said AN-GW.

In an embodiment, mapping of TNAN connectivity QoS to Trusted Non 3GPPRadio QoS is communicated by a Trusted Non 3GPP Radio Controller in saidTrusted non-3GPP Access Network (TNAN) to the UE via Trusted Non 3GPPRadio signalling.

In an embodiment, information on the mapping of TNAN connectivity QoS toTrusted Non 3GPP Radio QoS is exchanged between the Access NetworkGateway AN-GW and the Trusted Non 3GPP Radio Controller in said Trustednon-3GPP Access Network (TNAN).

In an embodiment, said method comprises:

said UE using said QoS control information from said AN-GW to map uplinktraffic flows to said TNAN connectivity QoS for uplink traffic.

Other embodiments may also be provided, based on above description.

In other aspects, there are provided various entities configured tocarry out related step(s) of such method, said entities including, inparticular (though not exclusively): User Equipment UE, Trusted non-3GPPAccess Network Gateway AN-GW (such as in particular TWAG for TrustedWLAN access).

A person of skill in the art would readily recognize that steps ofvarious above-described methods can be performed by programmedcomputers. Herein, some embodiments are also intended to cover programstorage devices, e.g., digital data storage media, which are machine orcomputer readable and encode machine-executable or computer-executableprograms of instructions, wherein said instructions perform some or allof the steps of said above-described methods. The program storagedevices may be, e.g., digital memories, magnetic storage media such as amagnetic disks and magnetic tapes, hard drives, or optically readabledigital data storage media. The embodiments are also intended to covercomputers programmed to perform said steps of the above-describedmethods.

1. A method for support of Quality of Service QoS control in a mobilecommunication system wherein an User Equipment has access to a mobilenetwork providing Packet Data Network PDN connectivity services, saidmobile network including a 3GPP Core Network CN accessed by a trustednon-3GPP Access Network (TNAN) via an interface between an AccessNetwork Gateway AN-GW in said Trusted non-3GPP Access Network (TNAN) anda PDN Gateway PDN-GW in said 3GPP CN, said method including support of3GPP CN-initiated QoS control, for uplink traffic from said UE, based onQoS control information received by said UE, said QoS controlinformation allowing the UE to associate uplink traffic flows sent bythe UE via Access Network Gateway AN-GW towards a PDN Gateway PDN-GWwith TNAN connectivity QoS for uplink traffic.
 2. A method according toclaim 1, wherein said QoS control information received by said UEincludes packet filter information associated with uplink traffic flows.3. A method according to claim 1, wherein said QoS control informationreceived by said UE includes first QoS control information associatinguplink traffic flows with 3GPP CN connectivity QoS, and second QoScontrol information mapping 3GPP CN connectivity QoS to TNANconnectivity QoS for uplink traffic.
 4. A method according to claim 3,wherein 3GPP CN connectivity QoS parameter information includes 3GPP QoSparameter information.
 5. A method according to claim 1, wherein TNANconnectivity QoS parameter information includes IP level QoS parameterinformation.
 6. A method according to claim 1, comprising: said AN-GWreceiving first QoS control information associating uplink traffic flowswith 3GPP CN connectivity QoS from said PDN-GW or from a PolicyController (PCRF).
 7. A method according to claim 1, comprising: saidAN-GW generating a mapping from 3GPP CN connectivity QoS to TNANconnectivity QoS for uplink traffic.
 8. A method according to claim 1,comprising: said AN-GW sending said QoS control information for uplinktraffic to said UE using a signalling protocol between said AN-GW andsaid UE.
 9. A method according to claim 1, comprising: said UEacknowledging the reception of said QoS control information from saidAN-GW, using a signalling protocol between said AN-GW and said UE.
 10. Amethod according to claim 1, wherein mapping of TNAN connectivity QoS toTrusted Non 3GPP Radio QoS is communicated by a Trusted Non 3GPP RadioController in said Trusted non-3GPP Access Network (TNAN) to the UE viasignalling over the air.
 11. A method according to claim 1, whereininformation on the mapping of TNAN connectivity QoS to Trusted Non 3GPPRadio QoS is exchanged between the Access Network Gateway AN-GW and theTrusted Non 3GPP Radio Controller in said Trusted non-3GPP AccessNetwork (TNAN) via signalling.
 12. A method according to claim 1,comprising: said UE using said QoS control information from said AN-GWto map uplink traffic flows to said TNAN connectivity QoS for uplinktraffic.
 13. An entity of a mobile communication system, said entityconfigured to carry out a method according to claim
 1. 14. A UserEquipment, said user equipment configured to carry out a methodaccording to claim 1.